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一个关于定语从句的题目求探究

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一个关于定语从句的题目求探究
There are several research centers in China________ a certain disease called Bird Flu is being studied.
A.which B.where C.when D.what
为什么不能选C?哪个先行词代表地点?
一个关于定语从句的题目求探究
选B 因为several research centers的意思是许多调查中心 整句的意思是 有许多调查中心在中国在这些调查中心中 一种最近的疾病叫 Bird Flu 正在被研究 这句先行词是centers 因为还原句子a certain disease called Bird Flu is being studied 后要加介词in 所以选where 假如这道题目 在china之前加了个in 那就是介词提前 用which
再问: 应该是在china后加吧?
再答: 额 对- - 打错了 There are several research centers in China in________ a certain disease called Bird Flu is being studied. 假如是这样的题目 就要填which了